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I think the vertical spacing exercise is important. It probably could have been achieved more simply than this. I didn't attempt the proximity challenge.
#15DaysOfCSS Day 6: Units Challenge 🐍
https://codepen.io/Shamar3/pen/MWoXzoY?editors=1100
I didn't sure if I understand the task well but with instructions I got this result.
We could use rem just for h1, h2, h3.
For p, rem, don't have effect.
https://codepen.io/miklaan/pen/abwKGGR
https://codepen.io/romola/pen/OJgZaRd?editors=1100
I think the vertical spacing exercise is important. It probably could have been achieved more simply than this. I didn't attempt the proximity challenge.
https://codepen.io/w0whitaker/pen/OJgZpop
https://codepen.io/kldickenson/pen/wvejepw